Optical Illusions
by Gianni A. Sarcone and Marie J. Waeber

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    Geometric Illusions 21    
 
 
Observe the diagram opposite. Are the grey shapes perfect squares? Are the sides of the black quadrilaterals straight? Do they have pointed corners?

Optical Effects with Squares

Are all the grey squares the same shade?

 
With the same square composition (with and
without outlines) we can obtain 2 shade effects

 

sheen effect
(the squares seem to stand out against the background)

halo effect
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